Paleomagnetic study of the northern Ford Ranges, western Marie Byrd Land, West Antarctica: motion between West and East Antarctica
Article Abstract:
The disagreement between the East Antarctica and the West Antarctica Marie Byrd Land poles is due to the rotations of the Pacific West and East Antarctica microplates and extension in the Ross Embayment during the Late Cretaceous period. Thermochronology and paleomagnetic data from metamorphic and igneous rocks from the Fosdick Mountains indicate a period of fast cooling. The cooling is explained by extension, intrusion, and uplift due to rifting between Campbell Plateau and Marie Byrd Land. The region appears to have been remagnetized during the middle Cretaceous period.
Publication Name: Tectonics
Subject: Earth sciences
ISSN: 0278-7407
Year: 1996
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Paleomagnetic evidence that the central block of Salinia (California) is not a far-traveled terrane
Article Abstract:
A paleomagnetic analysis of the red beds deposited on granites of the central block of Salinia in California showed a high-blocking-temperature overprint in the hematite. The hematite magnetization was a chemical remanence and developed right after deposition during pedogenesis. A magnetic polarity stratigraphy having antipodal normal and reversed directions were found in the bedding-corrected hematite remanence. These results suggest that the location of Salinia was within six degrees of its present cratonal North American position during the Late Cretaceous.
Publication Name: Tectonics
Subject: Earth sciences
ISSN: 0278-7407
Year: 1998
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Paleogene seafloor spreading in the southeast Tasman Sea
Article Abstract:
Old and new data were integrated to surmise the Paleogene tectonic evolution of the southeast Tasman oceanic crust. Focus was on the Paleocene-Eocene plate reorganization's structural aspects and on spreading direction changes. Results show that the spreading direction change in the Tasman Sea region near the end of the Paleocene gave rise to orthogonal seafloor fabrics on the sides of the Resolution Ridge system. Such change may have been too large or too fast to have been incrementally accommodated along the margin of the Tasman-Pacific plate.
Publication Name: Tectonics
Subject: Earth sciences
ISSN: 0278-7407
Year: 1996
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